using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Web;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebSqlHelper
{
    public sealed class Common
    {
        // Methods
        public static byte[] ConvertStringToByteArray(string s)
        {
            return new UnicodeEncoding().GetBytes(s);
        }

        public static string GetIP()
        {
            HttpRequest request = HttpContext.Current.Request;
            string userHostAddress = string.Empty;
            if ((request.ServerVariables["HTTP_X_FORWARDED_FOR"] == null) || (request.ServerVariables["HTTP_X_FORWARDED_FOR"] == ""))
            {
                userHostAddress = request.ServerVariables["REMOTE_ADDR"];
            }
            else
            {
                int index;
                if (request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(",") >= 0)
                {
                    index = request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(",");
                    userHostAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"].Substring(0, index - 1);
                }
                else if (request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(";") >= 0)
                {
                    index = request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(";");
                    userHostAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"].Substring(0, index - 1);
                }
                else
                {
                    userHostAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"];
                }
            }
            if ((userHostAddress == null) || (userHostAddress == string.Empty))
            {
                userHostAddress = HttpContext.Current.Request.UserHostAddress;
            }
            if (userHostAddress == "127.0.0.1")
            {
                userHostAddress = GetLocalhostIPAddress();
            }
            return userHostAddress;
        }

        private static string GetLocalhostIPAddress()
        {
            IPAddress[] addressList = Dns.GetHostByName(Dns.GetHostName()).AddressList;
            string str2 = string.Empty;
            for (int i = 0; i < addressList.Length; i++)
            {
                str2 = str2 + addressList[i].ToString();
            }
            return str2;
        }

        public static string GetNetIP()
        {
            try
            {
                Uri requestUri = new Uri("http://www.ikaka.com/ip/index.asp");
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUri);
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = 0;
                request.CookieContainer = new CookieContainer();
                request.GetRequestStream().Write(new byte[0], 0, 0);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("GB2312"));
                string input = reader.ReadToEnd();
                reader.Close();
                request.Abort();
                response.Close();
                Match match = Regex.Match(input, @"(?<IP>\d+\.\d+\.\d+\.\d+)");
                if (match.Success)
                {
                    return match.Groups["IP"].Value;
                }
                return GetIP();
            }
            catch
            {
                return GetIP();
            }
        }

        [DllImport("test.dll", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Unicode, ExactSpelling = true)]
        public static extern string Out_Char(string str, string key);
        public static string RndNum(int VcodeNum)
        {
            string[] strArray = "0,1,2,3,4,5,6,7,8,9".Split(new char[] { ',' });
            string str2 = "";
            Random random = new Random((int)DateTime.Now.Ticks);
            for (int i = 1; i < (VcodeNum + 1); i++)
            {
                int index = random.Next(strArray.Length);
                str2 = str2 + strArray[index];
            }
            return str2;
        }


        public static void TrimChildText(Control parentControl)
        {
            foreach (Control c in parentControl.Controls)
            {
                if (c is TextBox)
                {
                    TextBox txt = c as TextBox;
                    txt.Text = txt.Text.Trim();
                }
            }
        }

        public static bool isCntrNO(string no)
        {
            String regex = @"^[a-zA-Z]{4}\d{7}$";
            if (Regex.IsMatch(no, regex))
            {
                return true;
            }
            else
            {
                return false;
            }
        }

    }
}